Formulas
Perimeter/Circumference
Just for Fun
100
What formula do we use t find the area of a rectangle or parallelogram?
A = base x height
100
How do you find the perimeter of a given shape?
Add up the lengths of all of the outside sides.
100
What is the area of the circle below?
Area ≈ 63.62 in2
200
What formula do we use to find the area of a triangle?
A = 1/2 x b x h
200
What formula do you use to find the circumference of a circle?
C = 2 π r
200
Find the area of the shape below.
A = 36 cm2
300
What formula do we use to find the area of a trapezoid?
A = 1/2 (b1 + b2) x h
300
What is the perimeter of a rectangle with the given side lengths?
P = 7 + 4 + 7 + 4 = 22 yd
300
What is the area of the trapezoid?
A = 42.5 cm2
400
What formula do we use to find the area of a circle?
A = π x r2
400
What is the circumference of a circle that has a radius of 7 m?
2 x π x 7m ≈ 43.98 m
400
What is the area of the circle?
A ≈ 397.56